diff --git a/apps/common/main/lib/controller/Chat.js b/apps/common/main/lib/controller/Chat.js
index 767f44742..74d51fcc8 100644
--- a/apps/common/main/lib/controller/Chat.js
+++ b/apps/common/main/lib/controller/Chat.js
@@ -80,14 +80,17 @@ define([
         setMode: function(mode) {
             this.mode = mode;
 
-            if (this.api && this.mode.canCoAuthoring) {
-                if (this.mode.canChat)
+            if (this.api) {
+                if (this.mode.canCoAuthoring && this.mode.canChat)
                     this.api.asc_registerCallback('asc_onCoAuthoringChatReceiveMessage', _.bind(this.onReceiveMessage, this));
-                this.api.asc_registerCallback('asc_onAuthParticipantsChanged', _.bind(this.onUsersChanged, this));
-                this.api.asc_registerCallback('asc_onConnectionStateChanged', _.bind(this.onUserConnection, this));
 
-                this.api.asc_coAuthoringGetUsers();
-                if (this.mode.canChat)
+                if ( !this.mode.isEditDiagram && !this.mode.isEditMailMerge ) {
+                    this.api.asc_registerCallback('asc_onAuthParticipantsChanged', _.bind(this.onUsersChanged, this));
+                    this.api.asc_registerCallback('asc_onConnectionStateChanged', _.bind(this.onUserConnection, this));
+                    this.api.asc_coAuthoringGetUsers();
+                }
+
+                if (this.mode.canCoAuthoring && this.mode.canChat)
                     this.api.asc_coAuthoringChatGetMessages();
             }
             return this;
@@ -100,7 +103,7 @@ define([
         },
 
         onUsersChanged: function(users){
-            if (!this.mode.canLicense) {
+            if (!this.mode.canLicense || !this.mode.canCoAuthoring) {
                 var len = 0;
                 for (name in users) {
                     if (undefined !== name) len++;
diff --git a/apps/documenteditor/main/app/controller/Main.js b/apps/documenteditor/main/app/controller/Main.js
index 867b7de8a..6b38ea688 100644
--- a/apps/documenteditor/main/app/controller/Main.js
+++ b/apps/documenteditor/main/app/controller/Main.js
@@ -837,11 +837,9 @@ define([
                 application.getController('Common.Controllers.ExternalDiagramEditor').setApi(this.api).loadConfig({config:this.editorConfig, customization: this.editorConfig.customization});
                 application.getController('Common.Controllers.ExternalMergeEditor').setApi(this.api).loadConfig({config:this.editorConfig, customization: this.editorConfig.customization});
 
-                if (!me.appOptions.isLightVersion) {
-                    pluginsController.setApi(me.api);
-                    me.updatePluginsList(me.plugins);
-                    me.api.asc_registerCallback('asc_onPluginsInit', _.bind(me.updatePluginsList, me));
-                }
+                pluginsController.setApi(me.api);
+                me.updatePluginsList(me.plugins);
+                me.api.asc_registerCallback('asc_onPluginsInit', _.bind(me.updatePluginsList, me));
 
                 documentHolderController.setApi(me.api);
                 documentHolderController.createDelayedElements();
@@ -934,13 +932,13 @@ define([
             },
 
             onEditorPermissions: function(params) {
-                /** coauthoring begin **/
-                this.appOptions.canCoAuthoring = true;
-                /** coauthoring end **/
                 this.permissions.review = (this.permissions.review === undefined) ? (this.permissions.edit !== false) : this.permissions.review;
                 this.appOptions.canAnalytics   = params.asc_getIsAnalyticsEnable();
                 this.appOptions.canLicense     = params.asc_getCanLicense ? params.asc_getCanLicense() : false;
                 this.appOptions.isLightVersion = params.asc_getIsLight();
+                /** coauthoring begin **/
+                this.appOptions.canCoAuthoring = !this.appOptions.isLightVersion;
+                /** coauthoring end **/
                 this.appOptions.isOffline      = this.api.asc_isOffline();
                 this.appOptions.isReviewOnly   = (this.permissions.review === true) && (this.permissions.edit === false);
                 this.appOptions.canRequestEditRights = this.editorConfig.canRequestEditRights;
@@ -949,7 +947,7 @@ define([
                                                  (!this.appOptions.isReviewOnly || this.appOptions.canLicense); // if isReviewOnly==true -> canLicense must be true
                 this.appOptions.isEdit         = this.appOptions.canLicense && this.appOptions.canEdit && this.editorConfig.mode !== 'view';
                 this.appOptions.canReview      = this.appOptions.canLicense && this.appOptions.isEdit && (this.permissions.review===true);
-                this.appOptions.canUseHistory  = this.appOptions.canLicense && this.editorConfig.canUseHistory && (this.permissions.edit !== false) && this.appOptions.canCoAuthoring && !this.appOptions.isDesktopApp;
+                this.appOptions.canUseHistory  = this.appOptions.canLicense && !this.appOptions.isLightVersion && this.editorConfig.canUseHistory && (this.permissions.edit !== false) && this.appOptions.canCoAuthoring && !this.appOptions.isDesktopApp;
                 this.appOptions.canHistoryClose  = this.editorConfig.canHistoryClose;
                 this.appOptions.canUseMailMerge= this.appOptions.canLicense && this.appOptions.canEdit && !this.appOptions.isDesktopApp;
                 this.appOptions.canSendEmailAddresses  = this.appOptions.canLicense && this.editorConfig.canSendEmailAddresses && this.appOptions.canEdit && this.appOptions.canCoAuthoring;
diff --git a/apps/presentationeditor/main/app/controller/Main.js b/apps/presentationeditor/main/app/controller/Main.js
index dee6c72d6..f539a9077 100644
--- a/apps/presentationeditor/main/app/controller/Main.js
+++ b/apps/presentationeditor/main/app/controller/Main.js
@@ -715,12 +715,12 @@ define([
             },
 
             onEditorPermissions: function(params) {
-                /** coauthoring begin **/
-                this.appOptions.canCoAuthoring = true;
-                /** coauthoring end **/
                 this.appOptions.isOffline      = this.api.asc_isOffline();
                 this.appOptions.canLicense     = params.asc_getCanLicense ? params.asc_getCanLicense() : false;
                 this.appOptions.isLightVersion = params.asc_getIsLight();
+                /** coauthoring begin **/
+                this.appOptions.canCoAuthoring = !this.appOptions.isLightVersion;
+                /** coauthoring end **/
                 this.appOptions.canRequestEditRights = this.editorConfig.canRequestEditRights;
                 this.appOptions.canEdit        = this.permissions.edit !== false && // can edit
                                                  (this.editorConfig.canRequestEditRights || this.editorConfig.mode !== 'view'); // if mode=="view" -> canRequestEditRights must be defined
diff --git a/apps/spreadsheeteditor/main/app/controller/Main.js b/apps/spreadsheeteditor/main/app/controller/Main.js
index 49932f45a..0be88d8ae 100644
--- a/apps/spreadsheeteditor/main/app/controller/Main.js
+++ b/apps/spreadsheeteditor/main/app/controller/Main.js
@@ -595,7 +595,7 @@ define([
                 leftMenuView.getMenu('file').loadDocument({doc:me.appOptions.spreadsheet});
                 leftmenuController.setMode(me.appOptions).createDelayedElements().setApi(me.api);
 
-                 if (!me.appOptions.isLightVersion && !me.appOptions.isEditMailMerge && !me.appOptions.isEditDiagram) {
+                 if (!me.appOptions.isEditMailMerge && !me.appOptions.isEditDiagram) {
                     pluginsController.setApi(me.api);
                     me.updatePluginsList(me.plugins);
                     me.api.asc_registerCallback('asc_onPluginsInit', _.bind(me.updatePluginsList, me));
@@ -735,12 +735,12 @@ define([
                     this.appOptions.canAutosave = true;
                     this.appOptions.canAnalytics = params.asc_getIsAnalyticsEnable();
 
-                    /** coauthoring begin **/
-                    this.appOptions.canCoAuthoring = true;
-                    /** coauthoring end **/
                     this.appOptions.isOffline      = this.api.asc_isOffline();
                     this.appOptions.canLicense     = params.asc_getCanLicense ? params.asc_getCanLicense() : false;
                     this.appOptions.isLightVersion = params.asc_getIsLight();
+                    /** coauthoring begin **/
+                    this.appOptions.canCoAuthoring = !this.appOptions.isLightVersion;
+                    /** coauthoring end **/
                     this.appOptions.canComments    = this.appOptions.canLicense && !((typeof (this.editorConfig.customization) == 'object') && this.editorConfig.customization.comments===false);
                     this.appOptions.canChat        = this.appOptions.canLicense && !this.appOptions.isOffline && !((typeof (this.editorConfig.customization) == 'object') && this.editorConfig.customization.chat===false);